This is a simple build , it only has 111 parts and weighs about 737 g , you get track with this build and enough to make a oval track , the fun part is using the whistle to start and stop the train . The microphone is hooked up to some electronic wizardry and sits on top of the main drive gear , the battery box is the coal wagon and can be accessed enough to change polarity . This came out in 1968 so is now 50 yrs old , but you could add your own personal touch .